Straightening and rolling machine



'j3pl K. F. UNGERER STRAIGHTENING AND ROLLING MACHINE Filed Dec. 20, 1928 3 Sheets-Sheet y 3, 1932- K. F. UNGERER 1,856,937

STRAIGHTENING AND ROLLING MACHINE Filed Dec. 20, 1928' :s Sheets-Sheet 2 7 May 3, 1932. U G R 1,856,937

STRAIGHTENING AND ROLLING MACHINE Filed Dec. 20, 1928 3 Sheets-Sheet 3 V i a a, a 414 MIW Patented May 3, 1932 umran; srA'ras PATENT-K OFFICE xm ramnmcnnnema, or rronznm'm, ennmm s'rmen'rnnmo am) ROLLING mourns Application filed December 20, 1828, Serial/Fatwa, and in Germany December 27, 1927.

This invention relates to a and rolling machine.v I The straightening rolls of the modern straightening machines are so thin that, for

6 obtaining a good straightening result, the

must be forced more or less strongly towar s the materal to be straightened by part stretchings of the material 'to be straightened b means of adjustable supporting elements. Silch thin straightening rol s are en to the objection that t ey yield when wor 'ng as if they were not supported on their entire.

length. This supporting has hitherto been effected by mounting the straightening rolls in their whole length in troughs, from which the surface ofthe stfaighteningrolls projects just sufliciently for straightening the platepassing thereover. 'As the straightening is carriedout at a high pressure, the frictional resistance naturally increases in the trough hearings in proportion to the length of the straightening rolls and the width of the plate tobe straightened.

The object of this invention is, to effect a reduction of this'frietional resistance or to rolling friction, at the same. time allowing advantageous sagging of the straightening rolls towards the material being straightened.

stretching machines or ofthe rolling mills are supported on surfaces; over which they roll during tlie straightening or rolling operation.

An embodiment of the invention is illustrated by way of example in the accompany ing drawings in which:

Fig. 1 is a side elevation showing the improved-straightening machine without pin- 1011118 and rack, for driving'the straightening ro f V i Fig. 2 is a section on line 22'of Fig. 1. v

Fig. 3 shows in to plan view the lower machine frame with ower supporting surface. j

- Q 4 shows in side elevation and Fig. 5 in top pla'n'view the cou'pling'point of the roll frames in section on line 5-5 of Fig.1 4. I x 'g. 6 showsintop plan view the device straightening The novelty consists in that the rolls of the J "formed by the straightening roll fra for adjusting thesupporting irons arranged on the supporting yoke.

' The under frame a of the machine forms a perfectly plane supporting surface a for the lower straightening rolls 6. Two offset pora tions a are provided on the base frame of able frame 6 6 respectively. The lower frame 6 is guided by means of rollers 6 on the lower machine frame a, the upper frame 6 being suspendedaby means of rollers 6 on 1 the supporting yoke d. The two frames 6 and e are connected with each other by a transverse shaft 7 so that they .carry' out together the shifting movements in the direction of thearrow line A necessary for the straightening of the sheet metal passin through between the straightening rolls b an e. The connection of the lower roll frame 5 ,with the upper roll frame 6 is effected by means of the shaft f. This shaft is mounted in the bearings e. of the forks e ofthe upperframe e eccentricv fi is keyed on the shaft f" between the forks e- Two prongs 0 b5. Projectfror'n the lower straightening roll frame 15 and bear one on each side of the eccentric f Consequently every movement in the direction of the arrgw A (Fig. 1) per-f me 1 is imparted to the upper straightening roll frame e the motive force being transmitted from the prongs 6 to the eccentric f and from this latter to the shaft '7? and from the shaft 7 to the forks 0 and thus to the upper straighteni g roll frame 6 The lower and upper straightening rolls 6, e respectively carry on the. end projecting from the frames. Ia -e respectively a pinion- 6 e respectively, said pinions-b'eing displaced in the horizontal plane so that they gear freely with a rack g, h respectively, fixed on 'the one offset portiona of the lower machine frame and on the supporting yoked respectively, said racks being of double the width of the pinions b 6 respectively. The lower and upper straightening rolls 6, e are thus forced to roll on the supporting surfaces a d respectively during the shifting movements of the frames 6 6 respectively. The shifting movements of the roll frames 6 and e in the direction of the arrow line A are effected by means of spur 'wheels 2'; mounted in the lower machine frame a. The spur wheels 2}, receive their drive throiwh the intermediary of pinions mounted on the projecting ends of the main driving shaft 2', which is also journaled in the lower machine frame a. Between these pinions, towards the middle of the main driving shaft 2', a large toothed wheel is mounted with which thedriving pinion of a reversible electric motor azineshes. The reciprocating movement of the straightening rolls 1) and '6 in the direction A is effected simply by reversing thepoles of the electric motor. Evidently it would also be possible to change the direction of rotation of the shaft 2' and consequently the movement of the straightening rolls Z) and e by other means, for example a beltv reversing gear, such as is employed for example on planing machines for the reciprocating movement of the planin table. I

For the purpose of straightening, the end edge of the sheet is clamped between the upper and lower rolls 6 and e situated on the left end of the rows of straightening rolls (Fig. 1). The instant the two rows of rolls commence their common travel over the supporting surfaces (1 and d the sheet will be pulled more and more between the rows of rolls in exactly the same manner as on a known sheet straightening machine with stationary straightening roll bearings. The travels therefore as in theknown sheet straightening machines between the two rows of straightening rolls and finally drops on to the table plate a. The rows of straightening rolls 6 ande have thereby travelled from the left to the right end of the supporting 'sur face. If a single pass through the machine is insuificientto straighten the sheet, the other end of the sheet is fed from the table plate a between the upper and lower rolls 6 and e,

this time'however those on the right end of the rows of straightening rolls (Fig. 1)',*af-

ter whichthe return travel of the rows of rolls commences, during which the sheet again travels between the rows of straightening rolls, but this time in the opposite direc-' tion and finally, providing no table platen is provided on the left endpf the rows of straightening rolls, drops on the floor atthe instant, at which the ,rows of straightening rolls have reached their initial position shown in Fig. 1. Whilst the sheet is travelling through the machine it must evidently not be held in any manner, but must be left absostraightening rolls.

lutelv free for the conveying caused by the sheet.

rollers 6 e5 respectively and are journaled so that they can oscillate eccentrically in the frames 5 (2 respectively in such a manner that'these rolls 6, e as wellas the rollers 6 e bear permanently against their supporting surfaces.

The distance between the,upper and lower rows of straightening rolls b and e is adjusted by lifting and lowering the supporting yoke d. With this object in view the supporting yokeis supported by means of spiral springs k on the columns 0, the upper portions of said columns being constructed like screw spindles 0 The lifting and lowering of the supporting yoke ,d is effected by rotating the worm wheels Z,the hubs Z of which form nuts, and through the intermediary of worms m on the two shafts m. The shafts m, driven by a common hand wheel m arranged so that it is easily accessible, are connected with each other by suitable means, for instance'by a feed chain n so that all hubs or nuts i are rotated simultaneously.

Central portions of the sheet metal plate can be stretched by bending through the upper row of straight rolls e towards the material to be straightened. With this object in View the upper straightening rolls 0 are supported on the supporting yoke 03 not directly but through the intermediary of irons '(Z forming the upper supporting surface (1 The irons d have the shape of oblong wedges, the inclined plane of which bears shiftably against a corresponding inclined plane (Z (see Fig. 1) of the supporting yoke d and which end at both ends infingers d cl, respectively, by means of which they are suspended on transverse rods 0, 0 fixed in the supporting yoke cl. The upper supporting surface d formed by the irons (5 can become curved towards the straightening rolls e by pushing on the inclined plane of the supporting yoke (Z the extreme irons. This is effected by mean-s of a screw spindle p which termediate elementp upon blade springs 9 extending transversely overthe end faces of the fingers d and fixedon the supporting yoke (Z sothat they-can be bent more or less strongly with regard to the end faces of said finger d As the height of the bending curve of the blade prings 9 increases from the two sides tojards the middle, the central irons (Z are' ushed on the inclined plane of the supporting yoke d a greater distance than the extreme irons,.whereby to the upper supporting surface d a curve transversely to the direction of thearrow A and directed towards the straightening rolls e is given. By

this curve extending over the entire,supporting surface the upper Straightening rolls e are supported also in the bent state over their entire length.

The end faces of the fingers d; of the irons d bear also against blade springs 9 which are thereby, at the shifting of the irons d also curved in a curve congruent to -the curve at which the blade springs g are bent.

If the irons d are pushed back so far that the blade springs q and g are straight, the, supporting surface d is plane. -To bring back the irons d into their normal position the screw spindle p has to be screwed back. In order to keep the irons d in contact with the stretching blade spring q they are either suspended on the same or the opposite blade Springs 9 are selected of such strength that they push back the irons (1 The returnings of the irons (1 might however be etfected by a screw spindle acting upon the blade springs g and positively rotated together with the screw spindle p or by other suitable means so that the blade springs g and g are permanently in the same position.

In the ordinary straightening the lower and upper straightening rolls 6 and e are mutually displaced. In order to increase the stretching effect of the rolls, as will be sometimes necessary in the straightening of badly rolled sheet metals, it is advisable to bring the rolls into register with each other for one or two passes of the material to be straightened. .The rolls exert in this position a true rolling pressure upon the material producing the equalizing stretching. The point at which the lower and upper. roll frames 6 and c are coupled is constructed in such a manner that, according to requirements, the rolls 6 and e may be mutually displaced or brought into register with each other. With thisobject in view an eccentric f is fixed on each end of the transverse shaft 7, the circumference of said eccentric fitting accurately between two arms 6 of the lower frame 6 said arms engaging with a fork e; of the upper frame 6 he eccentrics f situated between the eyes 6 of the fork e and bearing against the sliding faces of the arms 6 can be rotated at the same time on both sides of the frames Z) and 6; 180 in the direction of the arrow B (Fig. 4) by means of the transverse shaft 7 rotatably mounted in the eyes 6 The centres of the lower and upper straightening rolls 6 and e are thereby brought accurately the one over the other. I

' In order that the sheet metal plate to be straightened is delivered plane from between the rolls,-the undulated gap formed between said rolls can enlarge towards the one delivering end or towards both ends. This may be obtained, as shown in Fig. 4:, for instance by making the extreme rolls 6 thinner. The.

1 pinions 0 are then omitted forthese thinner rolls 6, asotherwise the circumferential speed of the inner rolls would be different from the J speed of the sheet metal plate conveyed by the other rolls 6. The lower rolls 6 are however all'of the same diameter and their pinions 6 remain in gear with the rack g,and

they convey the straightening material to the delivering end. The journal holes for the thinner rolls 6 are displaced towards the upper supporting face d so that also the extreme delivering rolls are in touch with the uppersupporting surface.

Wire brushes 1', arranged between the lower straightenin rolls I) serve for removing the hammer sca e and the like, the ends of said wire brushes being mounted in slots 8 ofthe ly to the direction of movement A of the rolls.

One brush 7' may be arranged between every two lower straightening rolls 6.

A sheet metal plate can be straightened only by passing completely through between the rows of straightening rolls 6 and e. The supporting surfaces a and cl must therefore be at least as longasthe longest plateto be straightened plus double'the total length of the whole lower row' of rolls Z), which is al Ways the longer one of the two rows of rolls.

In order to prevent the delivered straight ened sheet metal from dropping, a table plate .10 may be arranged on one delivering side or on both delivering sides of the lower frame 6 said table frame resting on brackets '0 fixed on the end face of the frame 6 Any desired number of rolls 6 and 6 may -be provided. If in an upper and lower frame only one roll is ournaled. in each frame, these frames form a rolling mill which, if the rolls are very thin, exerts a very good stretching action.

I claim:

1. A straightening and rolling machine comprising in combination /with the upper and lower straightening or rolling rolls, an upper supporting surface, and a lower'supporting surface over which said rolls roll during the straightening and rolling operation.

2. A straightening and rolling machine as specified in claim 1, comprising in com-v blnation an upper row of straightenlng and rolling rolls, a lower row of straightening androlling rolls, an upper supporting surface, and a lower supporting surface over which said rolls roll.

3. A straightening and rolling machine as specified in claim 1, comprisingin combination with a lower row of rolls and with an upper rowof rolls, a lower supporting surface formed by the lower machine. frame, a

4 row of straightenin rolls journaled in said supporting yoke forming an upper supportforming an upper supporting surface, means for adjusting the distance between said yoke and said under frame, a frame suspended in said yoke, a frame guided in said lower n1achine frame, a row of straightening rolls journaled in said lower frame, a row of straightening rolls journaled in' said upper frame so that said rows of rolls bear against the corresponding supporting surface, means for coupling said frames with each other, and means for shifting said frames simultaneously. I v

5. A straightening and rolling machine comprising in combination a lower machine frame forming a lower supporting surface, a supporting yoke forming an upper sup porting surface,'means for adjusting thedis- 'tance between said upper supporting surface and said lower supporting surface, a frame suspended in said yoke, a frame guided in said lower machine frame, a row of straightening'rolls*journaled in said lower frame, a

upper frame, a rac on said lower frame,

[a pinion on the corresponding end of each as claimed in claim 5, comprising in combi roll of said lower row of straightening rolls meshing with'said rack, a rack on said sup porting yoke, a pinion ontho corresponding end of each roll of said upper row of straightemng rolls meshing with saidrack, and means for shifting. to and fro said frames simultaneously said rolls rolling on the correspond-- ing supporting surfaces.

6. A straightening and rolling machine as claimed in claim 5, comprising a lower supporting surface formed by the lowermachine frame having apertures through which the hammer scale drops; I L

7. A straightening and rolling machine nation a lower row of rolls, a lower supportmg surface formed by the lower machine frame having slots through which the ham-- mer scale drops said slots extending obliquely to the'direction of movement of said rolls.

8. A straightening and rolling machine as claimed in claim 5, in which the upper supporting surface on said support-ing yoke having an inclined lower surface consists of irons each in the shape of a flat wedge the inclined plane of which bears against the inclined lower surface,of said supporting yoke, and means for shifting said irons on said supporting yoke to form a downwardly directed curve in said supporting surface.

9. A straightening and rolling machine as claimed in claim 5, in which the upper sup plane of which bears against the inclined lower surface of said supporting yoke,-blade springs bearing one against each end of said wedge shaped rows, and means for bending one-of said blade springs to shift the corresponding irons onsaid inclined surface of said supporting yoke to form a curved supporting surface.

10. A straightening and rolling. machine as specified in claim 5, comprising in combination with the lower rolls and the upper rolls, a supporting frame for said lower rolls, a supporting framefor said upper rolls, and means for mutually shifting said roll supporting frames half the distance between the centres of two rolls so that said rolls may be adjusted to the straightening position and to the true rolling position respectively. 1

11. A straightening and rolling machine as specified in claim 5, comprising in combination with the lower rolls and the upper rolls, a supporting frame for said lower rolls, a supporting frame for said upper rolls, a shaft journaled in said upper roll frame, an eccentric on said-shaft, and two vertical arms projecting upwardly from said lower roll frame said eccentric bearing against the vertical inner sides of said arms so that said roll frames are mutually shifted half the distance between the centres of two rolls so that said rolls may be adjusted to the straightening position and to the true rolling position respectively.

12. A straightening and rolling machine as specified in claim 5, comprisin in combination with the lower supporting rame having Vertical slots, a row of lower straightening rolls, wire brushes one between every two lower rolls extending transversely over the lower supporting surface and loosely guided in said slots so that they are pressed by gravity against said lower supporting surface.

13. A straightening and rolling machine as specified in claim 5, comprising in combination the lower machine frame, brackets fixed on the end of said lower machine frame, and a table plate on said brackets adapted to receive the sheet metal plate delivered from i the machine,

.14. A straightening and rolling machine. as specified in claim 5, in which the end rolls in the upper. row of straightening rolls and in the lower row of straightening rolls are of eter than the middle rolls so that the gap between the two rows of rolls is enlarged towards the ends the journal holes of said thinner end rolls being displaced towards said supporting surfaces so that also the said ind rolls are in touch with said supporting aces.

In testimony whereof I aflix my signature.

KARL FRIEDRICH UN GERER. 

